Two new alkaloids, maistemonine and oxymaistemonine were isolated from the roots of $temona mairei collected from Yunnan Province, southwest of China. Their structures were elucidated by 2D-NMR techniques including ~1...Two new alkaloids, maistemonine and oxymaistemonine were isolated from the roots of $temona mairei collected from Yunnan Province, southwest of China. Their structures were elucidated by 2D-NMR techniques including ~1H-~1H COSY, ^(13)C-~1H-COSY, NOESY and other spectral analyses.展开更多
Four new alkaloids, didehydroprotostemonine, isoprotostemonine, neostemonine and stemodiol, were isolated from the roots of a Chinese medicinal plant, Stemona japonica, collected form Zhejiang Province, southern China...Four new alkaloids, didehydroprotostemonine, isoprotostemonine, neostemonine and stemodiol, were isolated from the roots of a Chinese medicinal plant, Stemona japonica, collected form Zhejiang Province, southern China. Their structures were elucidated by extensive spectral analyses.展开更多
A minor new diterpenoid alkaloid, soulidine, was isolated from the roots of DelphiniumSouliei Franch, its structure was established on the basis of spectral evidences.
Continuing investigation of Delphinium souliei Franch yielded two minor new diterpenoid alkaloids--souline E(1) and souline F(2), their structures were determined on the basis of spectroscopic evidences.
Two new indole alkaloids named 152-hydroxy-14,15-dihydro-vindo- linine and 152-hydroxy-14,15-dihydro-16-epi-vindolinine were isolated from Melodinus morsei.Their structures were established by spectroscopic means and ...Two new indole alkaloids named 152-hydroxy-14,15-dihydro-vindo- linine and 152-hydroxy-14,15-dihydro-16-epi-vindolinine were isolated from Melodinus morsei.Their structures were established by spectroscopic means and comparison with related compounds.展开更多
Two new D/E trans-5(?)-cevanine alkaloids,Dongbernine and Dongbeirine,have been isolated from Fritillaria thunbergii Miq.var.chekiangensis together with six known compounds,peimine,peiminine,isoverticine,verticindiol,...Two new D/E trans-5(?)-cevanine alkaloids,Dongbernine and Dongbeirine,have been isolated from Fritillaria thunbergii Miq.var.chekiangensis together with six known compounds,peimine,peiminine,isoverticine,verticindiol,B—sitosterol daucoterol.展开更多
Aim Investigation of alkaloids from the leaves of Brazilian medicinal plantCroton hemiargyerius var. gymnodiscus. Methods Silica gel column chromatography was used repeatedlyfor the isolation and purification, and the...Aim Investigation of alkaloids from the leaves of Brazilian medicinal plantCroton hemiargyerius var. gymnodiscus. Methods Silica gel column chromatography was used repeatedlyfor the isolation and purification, and their structures were identified by extensive spectroscopyand comparison of the chemical and physical data with those of authentic samples reported inliterature. Results Twelve alkaloids were isolated and their structures were identified. ConclusionFour new alkaloids named hemiargines A (1), B (5), C (6) and D (7), together with eight knownalkaloids namely isoc-orydine (2), corydine (3), norcorydine (4), salutaridine (8), glaucine (9),tetrahydropalmatrubine (10), xylopinoine (11), and norlaudanosine (12) were isolated.展开更多
From the bulbs of Fritillaria siechuanica S.C.Chen cultivated in Sichuan province,a new steroidal alkaloid,siechuansine,was isolated.Spectral methods demonstrated that it is a 13—epimer of wanpeinine A.
A new aporphine alkaloid, named fuzitine, was isolated from the tuber of Aconitum carmicheali Debx, and its chemical structure was established'on the basis of spectral analysis and chemical reaction.
Amsosinine,a new indole alkaloid was isolated from Amsonia sinensis.Its structure and relative configuration have been determined by detailed spectral studies.The X-ray crystal structure analysis fur- ther confirms ou...Amsosinine,a new indole alkaloid was isolated from Amsonia sinensis.Its structure and relative configuration have been determined by detailed spectral studies.The X-ray crystal structure analysis fur- ther confirms our assignments.展开更多
A new β-dihydroagarofuran alkaloid Ⅰ was isolated from Celastrus angulatus.The structure was established on the basis of 1D and 2D NMR analysis,and x-ray diffraction.
Two new alkaloids,hordenine-O- -L-rhamnopyranoside(Ⅰ)and hordenine -0-(6′-trans-cinnamoyl)-4′-O-β-D-glucopyranosyl- -L-rhamnopyranoside(Ⅲ) isolated from Selaginella doederleinii have been synthesized the first ti...Two new alkaloids,hordenine-O- -L-rhamnopyranoside(Ⅰ)and hordenine -0-(6′-trans-cinnamoyl)-4′-O-β-D-glucopyranosyl- -L-rhamnopyranoside(Ⅲ) isolated from Selaginella doederleinii have been synthesized the first time. A new method,in which trifluoroacetoxyl group was used both as a good leaving group and a protecting group for synthesis of O-glycosides with high stereo- selectivity was reported.展开更多
The present phytochenucal study was undertaken to investigate the chemical constituents of the 95%EtOH extract of the dried roots of Rehmannia glutinosa.The compounds were isolated and purified by Diaion HP-20,Toyopea...The present phytochenucal study was undertaken to investigate the chemical constituents of the 95%EtOH extract of the dried roots of Rehmannia glutinosa.The compounds were isolated and purified by Diaion HP-20,Toyopearl HW-40,silica gel column chromatography and preparative HPLC,and the structures were identified on展开更多
文摘Two new alkaloids, maistemonine and oxymaistemonine were isolated from the roots of $temona mairei collected from Yunnan Province, southwest of China. Their structures were elucidated by 2D-NMR techniques including ~1H-~1H COSY, ^(13)C-~1H-COSY, NOESY and other spectral analyses.
文摘Four new alkaloids, didehydroprotostemonine, isoprotostemonine, neostemonine and stemodiol, were isolated from the roots of a Chinese medicinal plant, Stemona japonica, collected form Zhejiang Province, southern China. Their structures were elucidated by extensive spectral analyses.
文摘A minor new diterpenoid alkaloid, soulidine, was isolated from the roots of DelphiniumSouliei Franch, its structure was established on the basis of spectral evidences.
文摘Continuing investigation of Delphinium souliei Franch yielded two minor new diterpenoid alkaloids--souline E(1) and souline F(2), their structures were determined on the basis of spectroscopic evidences.
文摘Two new indole alkaloids named 152-hydroxy-14,15-dihydro-vindo- linine and 152-hydroxy-14,15-dihydro-16-epi-vindolinine were isolated from Melodinus morsei.Their structures were established by spectroscopic means and comparison with related compounds.
文摘Two new D/E trans-5(?)-cevanine alkaloids,Dongbernine and Dongbeirine,have been isolated from Fritillaria thunbergii Miq.var.chekiangensis together with six known compounds,peimine,peiminine,isoverticine,verticindiol,B—sitosterol daucoterol.
文摘Aim Investigation of alkaloids from the leaves of Brazilian medicinal plantCroton hemiargyerius var. gymnodiscus. Methods Silica gel column chromatography was used repeatedlyfor the isolation and purification, and their structures were identified by extensive spectroscopyand comparison of the chemical and physical data with those of authentic samples reported inliterature. Results Twelve alkaloids were isolated and their structures were identified. ConclusionFour new alkaloids named hemiargines A (1), B (5), C (6) and D (7), together with eight knownalkaloids namely isoc-orydine (2), corydine (3), norcorydine (4), salutaridine (8), glaucine (9),tetrahydropalmatrubine (10), xylopinoine (11), and norlaudanosine (12) were isolated.
基金project with finacial support by Chinese National Science Foundation
文摘From the bulbs of Fritillaria siechuanica S.C.Chen cultivated in Sichuan province,a new steroidal alkaloid,siechuansine,was isolated.Spectral methods demonstrated that it is a 13—epimer of wanpeinine A.
文摘A new aporphine alkaloid, named fuzitine, was isolated from the tuber of Aconitum carmicheali Debx, and its chemical structure was established'on the basis of spectral analysis and chemical reaction.
文摘Amsosinine,a new indole alkaloid was isolated from Amsonia sinensis.Its structure and relative configuration have been determined by detailed spectral studies.The X-ray crystal structure analysis fur- ther confirms our assignments.
文摘A new β-dihydroagarofuran alkaloid Ⅰ was isolated from Celastrus angulatus.The structure was established on the basis of 1D and 2D NMR analysis,and x-ray diffraction.
文摘Two new alkaloids,hordenine-O- -L-rhamnopyranoside(Ⅰ)and hordenine -0-(6′-trans-cinnamoyl)-4′-O-β-D-glucopyranosyl- -L-rhamnopyranoside(Ⅲ) isolated from Selaginella doederleinii have been synthesized the first time. A new method,in which trifluoroacetoxyl group was used both as a good leaving group and a protecting group for synthesis of O-glycosides with high stereo- selectivity was reported.
文摘The present phytochenucal study was undertaken to investigate the chemical constituents of the 95%EtOH extract of the dried roots of Rehmannia glutinosa.The compounds were isolated and purified by Diaion HP-20,Toyopearl HW-40,silica gel column chromatography and preparative HPLC,and the structures were identified on
